The official Cars 2 trailer can be seen as a 1 min 27 sec video on Facebook from stop-motion video ace, Patrick Boivin (Uploaded by PatrickBoivin to Facebook on May 18, 2011)
Worth watching! Lot's of LEGO in this one.
Link to the Facebook page: http://www.youtube.com/watch?v=6l6PPvUhR4c